Chapter 23:
Solutions
Practice Test
1.
At 20 °C, the solubility of sodium chloride, NaCl, in water is 35.9 g/100 mL. If the maximum amount of sodium chloride is dissolved in 500.0 mL of water at 20 °C, the mass of the dissolved sodium chloride is what percentage of the mass of the solution?
a.
7.2%
b.
35.9%
c.
26.4%
d.
6.7%
Hint
2.
How much surface area is lost if two cubes each with sides 4 cm in length are attached at one face?
a.
192 cm
2
b.
0 cm
2
c.
32 cm
2
d.
160 cm
2
Hint
3.
At 60 °C, the solubility of sucrose (sugar) in water is 287.3 g/100 mL. At this temperature, what is the minimum amount of water needed to dissolve 50.0 g of sucrose?
a.
17.4 mL
b.
287.3 mL
c.
100. mL
d.
574.6 mL
Hint
4.
A Sacagawea dollar coin is made of manganese brass alloy that is 1/25 nickel. Express this number as a percentage.
a.
25%
b.
1%
c.
4%
d.
1.25%
Hint
5.
A cup of orange juice contains 126 mg of vitamin C and 1/2 cup of strawberries contain 42 mg of vitamin C. How many cups of strawberries contain as much vitamin C as one cup of orange juice?
a.
1 cup
b.
1 1/2 cups
c.
3 cups
d.
1/6 cup
Hint
6.
A cube has sides that are 2 cm in length. If the cube is split in half, what is the total surface area of the two pieces?
a.
12 cm
2
b.
16 cm
2
c.
32 cm
2
d.
24 cm
2
Hint
7.
What is the increase in surface area when a cube with sides 2 cm in length is divided into eight equal parts?
a.
48 cm
2
b.
12 cm
2
c.
0 cm
2
d.
24 cm
2
Hint
8.
What is the total surface area of a cube with a length, height, and width each of 2.0 cm?
a.
24 cm
2
b.
48 cm
2
c.
8 cm
2
d.
16 cm
2
Hint
9.
A fruit drink contains 90% water and 10% fruit juice. How much fruit juice does 500.0 mL of fruit drink contain?
a.
450 mL
b.
50 mL
c.
90 mL
d.
10 mL
Hint
10.
At 20 °C, the solubility in water of potassium bromide, KBr, is 65.3 g/100 mL. What is the maximum amount of potassium bromide that will dissolve in 237 mL of water?
a.
3.63 g
b.
155 g
c.
15,500 g
d.
65.3 g
Hint
